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Ethan Bateman

How to Monitor CRC Errors

Question

This isn't a question but I didn't see anybody else post this.  One thing we've noticed in our environment is that when a Gbic starts to go bad CRC errors start incrementing on a port.  Currently LM doesn't monitor for CRC errors, that we could find.  In order for this to work you have to go to the sub interface in config mode and turn on rmon statistics.  Then you get OID 1.3.6.1.2.1.16.1.1.1.X.Y where X is for CRC errors and Y is the number you assigned as the process ID.  For example on an HPE 5130

[HP5130-Ten-GigabitEthernet1/0/51]rmon statistics 1 owner LM

Gives you OID 1.3.6.1.2.1.16.1.1.1.8.1.  There are a lot of statics, for example the Y value of 3 gives you drops, the Y value of 5 gives you packets.

<HP5930>dis rmon statistics
EtherStatsEntry 1 owned by LM is VALID.
  Interface : Ten-GigabitEthernet1/0/51<ifIndex.12>
  etherStatsOctets         : 1943607812, etherStatsPkts          : 1369904813
  etherStatsBroadcastPkts  : 45523087  , etherStatsMulticastPkts : 97537116
  etherStatsUndersizePkts  : 0         , etherStatsOversizePkts  : 0
  etherStatsFragments      : 0         , etherStatsJabbers       : 0
  etherStatsCRCAlignErrors : 0         , etherStatsCollisions    : 0
  etherStatsDropEvents (insufficient resources): 0
  Incoming packets by size:
  64     : 1917342   ,  65-127  : 853770762 ,  128-255  : 724653502
  256-511: 178898662 ,  512-1023: 107338128 ,  1024-1518: 1995791637
 

So far we've found this process and OID to also work on Cisco switches. I hope this helps others.

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